How to Write TestCase in Java for this Service?

Question

I have a this class

public class AuthenticationModule {

    String userName = "foo";
    String password = "bar";

    public void setUserName(String userName) {
         this.userName = userName;
    }

    public void setPassword(String password ) {
         this.password = password ;
    }

    AuthenticationServicePort authenticationServicePort;
    AuthenticationService port;

    private boolean authenicate(String userName, String password) {

        authenticationServicePort = new AuthenticationServicePort();
        port = authenticationServicePort.getAuthenticationServiceProxy();
        return port.login(userName, password);
    }

    public boolean validateUser() {

        return authenicate(userName, password);
    }
}

and AuthenticationServicePort returns a WSDL port I want to create a simple test case with a Mock AuthenticationServicePort which will return a 'true/false' value

How do I inject in my own MockObject without changing the java code? Or worse case scenario, what is the easiest way to change to be be more easily testable.

Answer 1

Here is an example test where AuthenticationServicePort is mocked, using JMockit 1.13:

public class AuthenticationModuleTest
{
    @Tested AuthenticationModule authentication;
    @Mocked AuthenticationServicePort authenticationService;
    @Mocked AuthenticationService port;

    @Test
    public void validateUser()
    {
        final String userName = "tester";
        final String password = "12345";
        authentication.setUserName(userName);
        authentication.setPassword(password);
        new Expectations() {{ port.login(userName, password); result = true; }};

        boolean validated = authentication.validateUser();

        assertTrue(validated);
    }
}